[Mr70]

That's true.
And many stores have outdoor videocameras that most likely captured the incident.
You would've been wise to chase her down the minute it happened to the Mustang,and respectfully confront her & the store manager.I had a similar situation and this was how I handled it with great success,albeit for the situation itself.
They tape over those videotapes shortly thereafter,so the odds of it still being there might not be too good today.